Bailey Everts
Dr. Yuanlin Zhang
Problem Description
 Approach to obtaining the Knowledge
used to solve the problem
 The declarative knowledge used to
solve the problem
 Physician’s Input
 Report Generation
 Demo
 Questions
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Input: The frequencies from the left and
right side of the posterior, central and
anterior of brain, and the physician’s
observations.
Output: A list of abnormalities, if there is
any, and their corresponding clinical
correlations
Goal: identify the “declarative”
knowledge used to decide the output
from the input.
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Knowledge sources: the BASIC program written by
K.J. Oommen, M.D.
Translate BASIC program into Tables of
“procedural” knowledge in a systematic way
◦ Frequency Analysis
◦ Physician’s Input
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Translate “procedural knowledge” in the
Tables into declarative knowledge
Translate declarative knowledge into ASP
program
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Notations
◦ Section refers to posterior, central or anterior
◦ Side refers to left or right
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Definitions
Lower Bound
Frequency (Hz)
Upper Bound
Frequency (Hz)
Wavetype
0
4
Delta
4
8
Theta
8
14
Alpha
14
40
Beta
40
-
Mu*
* Different than BASIC code
Section
Normal Wave
Posterior
Alpha
Central
Theta or Alpha
Anterior
Beta
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A section is said to be symmetric if the
frequency on the left is the same as the
frequency on the right. It is asymmetric if it is
not symmetric.
A section is said to be bilateral asymmetric if
the wavetype on each side of a section is the
same but the frequency is different.
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A side of a section is abnormal if the wave of
this side is not normal.
A side of a section is said slowing if its frequency
is less than the normal frequency of this side.
A side of a section is said to have beta activity if
the frequency of this side is greater than the
normal frequency for that section.
A side of a section is said to be slowing with
respect to the other side if both sides have a
normal frequency, but that side is slower than
the other side
When there is a frequency that is not normal we
say that there is an abnormality.
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Slower than normal
◦ Describing Slowing:
 A side is Delta Slowing if it has Delta Wave.
 A side is Theta Slowing if it is slowing and has Theta
Wave. (Posterior or Anterior)
 Alpha Activity: Alpha Wave (Anterior
◦ Clinical Correlation: An underlying lesion
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Faster than normal (Beta Activity)
◦ Describing Beta Activity
 Beta Activity: Beta Wave (Posterior & Central)
 Prominent Beta Activity: Mu Wave (Anterior)
◦ Clinical Correlation: An underlying skull defect
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Abnormality Types are Delta Slowing, Theta
Slowing, Alpha Activity, Beta Activity,
Prominent Beta Activity
Locations are occipital (for posterior), central
(for central), and frontal (for anterior)
Merge is either bilateral symmetric or
bilateral asymmetric
If both sides of a section have Abnormality
Type “T”, Location “L”, and Merge “M” then
the abnormality is described as M + L + T (i.e
“bilateral symmetric frontal slowing”)
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If both sides of a section have the same
abnormality type we do not describe the sides
individually
To describe an abnormality type “T” on side
“S” in location “L” we use the form S + L + T
(i.e. “left parieto-occipital theta slowing”)
cType is either “skull defect” or “lesion”
To describe a clinical correlation we use the
form “an underlying” + L + cType (i.e “an
underlying frontal skull defect”)
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Classify as slowing or beta
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Describe symmetry
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Specify type of slowing/beta
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Describing bilateral symmetry
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Describing abnormalities on a single side
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Describing merged abnormalities
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Paroxysmal
Stage I Sleep*
Later Stage(s)*
Epileptiform Activity*
Photic Stimulation*
Hyperventilation*
Seizure(s) or Other
Events*
Cardio-Pulmonary
Events & Patterns of
Uncertain Significance
Excess Artifacts
* Potential for Abnormalities
Header
 Introduction
 Description
 Interpretation
 Footer
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